Synthesis 2021; 53(15): 2621-2631
DOI: 10.1055/s-0040-1706032
paper

Reactions of 4-Pyrones with Azomethine Ylides as a Chemo­selective Method for the Construction of Multisubstituted Pyrano[2,3-c]pyrrolidines

a   Institute of Natural Sciences and Mathematics, Ural Federal University, 51 Lenina Ave., 620000 Ekaterinburg, Russian Federation
,
Vyacheslav D. Steben’kov
a   Institute of Natural Sciences and Mathematics, Ural Federal University, 51 Lenina Ave., 620000 Ekaterinburg, Russian Federation
,
Konstantin L. Obydennov
b   Institute of Chemical Engineering, Ural Federal University, 28 Mira str., 620078 Ekaterinburg, Russian Federation
,
Sergey A. Usachev
a   Institute of Natural Sciences and Mathematics, Ural Federal University, 51 Lenina Ave., 620000 Ekaterinburg, Russian Federation
,
Vladimir S. Moshkin
a   Institute of Natural Sciences and Mathematics, Ural Federal University, 51 Lenina Ave., 620000 Ekaterinburg, Russian Federation
,
Vyacheslav Y. Sosnovskikh
a   Institute of Natural Sciences and Mathematics, Ural Federal University, 51 Lenina Ave., 620000 Ekaterinburg, Russian Federation
› Author Affiliations
This work was financially supported by the Russian Science Foundation (grant number 18-13-00186).


Abstract

4-Pyrones bearing electron-donating and electron-withdrawing groups react with nonstabilized azomethine ylides to form pyrano[2,3-c]pyrrolidines in moderate to good yields. The reaction proceeds chemoselectively as a 1,3-dipolar cycloaddition of the azomethine ylide at the carbon–carbon double bond of the pyrone activated by the electron-withdrawing substituent. The reactivity of 4-pyrones toward azomethine ylides was rationalized by computational studies with the use of reactivity indexes. The pyrano[2,3-c]pyrrolidine moiety could be modified, for example by a ring-opening transformation under the action of hydrazine to provide pyrazolyl-substituted pyrrolidines.

Supporting Information



Publication History

Received: 14 February 2021

Accepted after revision: 18 March 2021

Article published online:
13 April 2021

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